Efficiencies mainly, and relying on a 3000 watt inverter to push near 2500 watts as your primary propulsion. Drawing 200 or so amps from the bats won't be good either.
It just seems all a bit off. I know, it's just a discussion. Personally I think he'd be better off using the 600 bucks to purchase a golf cart and
use it's components (speed controller, reversing contactor, motor, etc.) to build a drive. Rewire the house batteries to 36 volt and use a converter to feed the house.
It just seems all a bit off. I know, it's just a discussion. Personally I think he'd be better off using the 600 bucks to purchase a golf cart and
use it's components (speed controller, reversing contactor, motor, etc.) to build a drive. Rewire the house batteries to 36 volt and use a converter to feed the house.
I just think, and it's my personal opinion, that moving the voltages up is a big waste of energy.
mattelderca
From: James Sizemore <james@deny.org>
To: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com>
Cc: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com>
Sent: Tuesday, December 11, 2012 4:03:59 PM
Subject: Re: [Electric Boats] scenario 34 foot chb fishing with 3hp 160 dc
The math is pretty simple hp to watts is 1:746 so 3hp = 2238 watts. So me telling him 3kw already had some fluff built in. Do i have enough fluff depends on the motor controller. But most inverters can surge past their max pretty far for a second or two. So I think 3kw is a good fit.Now for ohms law 2238 / 12 = 186 amp draw from his battery at max speed. So he said he had 6 golf cart batteries so assuming he has around a 200 AH pack. So he should get an hour out of it. If he wanted to take his house bank to empty and travel at full electric speed.A couple of hours at half throttle.What math did you have an issue with?
On Dec 11, 2012, at 2:20 PM, matt elder <mattelderca@yahoo.ca> wrote:I think some of the math may be way off here.
3 HP is more like 6000 watts of inverter power.
I doubt a 3000 watt inverter will run this motor, even if it did, the current it would draw at 12 volts is near 250 amps.
Then you will need to know if this controller will run on a modified square wave as most cheap inverters put out.
You may need a full sinewave inverter which will cost you. And then you may need to see if it will run at 50 or 60 cycles.
Just a few thoughts,mattelderca
From: James Sizemore <james@deny.org>
To: "electricboats@yahoogroups.com" <electricboats@yahoogroups.com>
Sent: Tuesday, December 11, 2012 1:56:25 PM
Subject: Re: [Electric Boats] scenario 34 foot chb fishing with 3hp 160 dc
The inverter is what will pull from the batteries and 12 volt to 220 volt single phase inverters are quite common in Europe, you never said what phase the motor kit your looking at needed, if it needs a 2 phase inverter those are less common and less cheap, but still exist.
On Dec 11, 2012, at 12:47 PM, Orest Iwaszko <orestyko@hotmail.com> wrote:Thanks for the response James , This deal comes with a variable speed controller. Yes Ill have to find a 220 volt 3000 watt inverter. Does 160 volt 3 hp sound doable eventually from batteries ?On 2012-12-11, at 10:37 AM, James Sizemore wrote:You will need a 3kw inverter. And the cheaper induction motors are normally on/off full speed so it might be hard to use in close quarters, unless you drop some euro's on a variable speed controller. But sound like an interesting project, for only a thousand or so expense.
On Dec 11, 2012, at 12:03 AM, Orest Iwaszko <orestyko@hotmail.com> wrote:Im back , Been drooling in my dreams about the magic you are creating . Ive come across a 3 hp 160 volt dc motor with a controller for $ 600. The controller needs 220 volts. input.
My boat is 34 feet and I only want to use this system for up to 3mph tops. Mostly 2.5 mph or less.
My boat has a Northern Lights 5 kw genset with both 110 and 220. So Im able to run off the gernerator. and would aquire a 220 volt inverter.
The dc motor will turn my 1.5 inch shaft with 20 inch prop at around 400 rpm for fishing
dc motor spins up to 1750 so at 900 rpm motor with a 3 /1 reduction my shaft should turn 300 rpm .
Im thinking to spin the shaft with a pully belt system .
I have 6 golf cart batteries used at 12 volts for the house system and for this project and would like to add solar panels and wind generator eventually .
Is this perusable in your opinion.
Orest 34 foot CHB
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